148 Improved Rotary Saw Machine. 



ingand falline of the feed pally, is effected by a lever with 

 a small steel spring at each end of it ; each spring has a 

 catch to lock on a pin in the side of the frame, to hold the 

 cogwheels in their mash, when the carnage is feeding and 

 returning. In the centre of the lever is a pin, which at- 

 taches it to the side of the frame, and is the fulcrum on 

 which it works. On the top of this lever, are two wooden 

 springs, which run from the centre to the end, a little ris- 

 ing, which forms an mclined plane. 



"a knob on the side of the carriage acts on the top of this 

 wooden ppiing as the carriage is feeding and returning, and 

 alternately unlocks the steel spring from the pin in the 

 fj-ame ; and the wooden spring causes that end of the lever, 

 where the knob is, to descend and the other to ascend and 

 locks its steel spring on the pin in the frame again. The 

 piece of wood, which contains the feed pulley, is attached 

 to that end of the lever which comes at the middle of the 

 frame, and causes it to ascend or descend at every travel of 

 the carriage. An iron frame is bolted firm on the end 

 cross piece of the carriage, which holds an iron hand with 

 a steel pointer in it, which, by means of a steel spring, locks 

 into the holes of the index, and keeps the log firm in its 

 place, while the saw is performing its cut. 



On the inside of the end cross piece of the frame, is a 

 shifting iron, w^hich is a horizontal bar of iron with an el- 

 bow, forming an acute angle on the outer end ; on the inner 

 end is another elbow, which turns down, forming a right 

 an^le, with a bar perforated with holes at suitable distances, 

 to correspond with the numbers of the index ; into the 

 holes in the bar a steel pointer 7 or 8 inches in length, may 

 be screwed, so as to enter the holes of the index. This 

 iron can move horizontally, being supported with hook 

 bolts, and is kept in place by a small spring acting on the 

 inner end ; and two guard screws, are set, so as to guide the 

 large pointer into one of the holes of the index when the 

 carriage and log return from the cut. 



On the other side of the frame, where the outer end of 

 the hand on the carriage passes is a small trip iron, that 

 strikes on the outer eiid of the hand and unlocks its poin- 

 ter from the index ; at the same time, the large pointer, 

 entering one of the holes of the index and the carriage, 

 striking the acute angle of the shifting iron, give it a hor- 



